JPS63290025A - Selective calling communication system - Google Patents

Abstract

PURPOSE:To send the information of an optional length by using very short continuation instruction signal to show whether the transmission of message information in a signal, sent from a base station, continues or not. CONSTITUTION:The signal to be sent from the base station consists of a synchronizing signal, and address signal, a message signal and the signal 1 to show whether the sending of the message signal has finished or still continues. Then, a receiver set, simultaneously with the decoding of the message signal, refers to the continuation instruction signal 1, and when the continuation instruction signal 1 indicates 'continuation ', it receives the subsequent address signal and the message signal continuously. Thus, the message information of the optional length can be transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radio paging system that makes it possible to transmit message information of any length using one system.

[Conventional technology]

! m31 is a diagram showing an example of a conventionally used selective call signal.

The selective calling operation performed using this signal will be explained below.

The selective calling signal is given a time slot for each group as shown in FIG.

In addition, as shown in Figure (e), the signals for each group are as follows:
The call signal consists of a synchronization signal and a call signal for the receiver to perform bit synchronization, word synchronization, and group synchronization, and the call signal further includes an address signal specifying the receiver to call and a message signal carrying message information to be transmitted to the receiver. It is composed of.

After starting reception, the receiver performs bit synchronization based on the synchronization signal.
Word synchronization and group synchronization are performed, and as described above, the intermittent reception state is established in which the user receives only the time slot in which the call signal for the group to which he/she belongs is sent.

[Problem I11 to be solved by the invention] In the conventional selective call communication system as described above, since the time t allocated to one group is fixed due to intermittent reception, it is difficult to send long message signals. Even if I try,
It is impossible to transmit long message information that spans other groups, and the message length is limited.

In addition, as shown in Figure 4, in the case of a method that uses intermittent reception to change the content or length of message information depending on the group, there is a disadvantage that there is a difference in the efficiency of time slot usage depending on the group, resulting in so-called division loss. there were.

That is, the receivers are divided into groups according to the content or length of the message information, and the base station calls the receivers of each group. When sending message information, for example, if a large number of calls are made at the same time, a group of only calls (
In Figure 4, there is a group (group 1) that carries out message information of character information that can only be called out in a small number of groups (group 4).
In the figure, group 3) also occupies the same time slot, and if the former occupies most of the number of calls per unit time, the latter time slot will hardly be used. There was a problem.

In view of these conventional shortcomings, the present invention provides a selective call communication method that is capable of transmitting message information of any length in a selective call communication method in which the message information length is mainly a short paging signal. is intended to provide.

[Means for solving problems]

According to the invention, the above-mentioned object is achieved by the means specified in the claims.

That is, in the synchronous selective call communication system of the present invention, address signals assigned to receivers are grouped by message information, and the address signal of the receiver to be called is initially sent in the time slot in which the address signal is sent. However, in the time slot of the subsequent address signal, an idle signal (in this specification, for example, "10
By transmitting meaningless signals such as "repetition of ``" and the same address No. 48, and inserting information as to whether the message signal will continue or not into the message signal, In some cases, message information of an arbitrary length can be transmitted by stopping intermittent reception and receiving data across other groups.

〔Example〕

FIG. 1 is a diagram showing the structure of a selective call signal according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of the operation of a receiver according to the present invention.

The following will explain based on these figures.

Receivers belong to one of multiple groups, and as shown in Figure 2 (, ), the base station sends out calls to the receivers in each group at regular intervals for a fixed period of time, and the receivers Usually performs receiving operations only when a call is being made to the group to which it belongs,
At other times, the operation of stopping reception is repeated.

On the other hand, as shown in Figure 1, the signals transmitted from the base station include a synchronization signal, an address signal, a message signal, and a signal indicating whether transmission of the message signal indicated by the number 1 has ended or is still continuing (hereinafter referred to as , continuation instruction signal).

Then, the receiver refers to the continuation instruction signal 1 as well as decoding the message signal, and determines that the continuation instruction signal 1 is "continuation".
, the next succeeding address signal and message signal will continue to be received. The base station sends the address signal of the receiver again in the next consecutive address signal time slot, or sends the address signal of the receiver again, for example, '10'.
. . . 10", meaningless idle signals are sent, and in message signal time slots, message signals are continuously sent and the receiver continues to receive them. can receive messages of length.

That is, in the case of the above configuration, as shown by the number 4 in the tJS2 diagram, the message is sent to the receiver M8! If the time slot ends with only the time slot for the group to which it belongs, the reception operation is not performed in the time slot of the next group as in the normal case, but if the time slot does not fall within the range indicated by the number 2 in Figure 2. (In the last call signal of the group, if continuation instruction signal 1 indicates continuation, only the receiver concerned will recognize that the continuation instruction signal is number 3 in Figure 2, which indicates non-continuation.) Reception continues until the time indicated.

Therefore, the message length is not limited to the timeslot length for the group.

Even if the continuation instruction signal cannot be received due to a signal error, etc., if the next part of the address signal is received, it is possible to identify whether or not to continue by receiving the address signal or idle signal of the receiver. is possible.

Also, when changing not only the length of the message but also the content, the relationship between the address signal sent from the base station and the message content should match the relationship between the receiver address and the message content that can be received. This allows for easy identification.

〔Effect of the invention〕

As explained above, in this system, by using a very short continuation instruction signal that indicates whether or not to continue transmitting message information in the signal sent from the base station, the length that the receiver receives is This has the advantage that it is possible to send out a report of any length.

In addition, since the basic signal configuration is the same as the conventional method,
It is possible to mix conventional receivers and receivers using this method in the same group, and there is little division loss.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing vtI& of a selective call signal according to an embodiment of the present invention, FIG. plS2 is a diagram explaining the operation of a receiver in the present invention, and FIG. 3 is a diagram showing an example of a conventional selective call signal.
FIG. 4 is a diagram illustrating a method of changing the content or length of message information depending on the group using conventional intermittent reception. 1...m continuous instruction signal, 2~4...
・・・Numerical symbol representing timing Representative Ibuji Honma Takashi 4 Diagram

Claims (1)

[Claims] The receivers are divided into multiple groups, and the signals sent from the base station are used to transmit information to the groups at regular intervals for a certain period of time, and each receiver receives the information sent from the base station for the group to which it belongs. In an intermittent reception selective calling communication system in which the signal is received only during the specified time period, and signals from other time periods are not received, the time slot used for transmitting information to each group is determined by the synchronization signal and the address signal of each receiver. , a transmission signal for the receiver, and a control signal indicating whether or not the next transmission information is also transmission information for the receiver, and the control signal allows the next transmission information to be transmitted. The address signal of the subsequent selective call signal is the same as the address signal of the idle signal or the immediately preceding selective call signal, and the address signal of the subsequent selective call signal is transmitted to the same receiver. A selective call communication method characterized by continuous transmission of information.